| In the development of urban modernization,underground space has become an important reserve resource for urban space expansion.Engineering geologic requirement is the critical factor of the underground space development,while the irrational development of human beings can extremely easily bring about the underground space resources waste and the geological disaster.For one thing,in the evaluation of the suitability of urban underground space development engineering geological requirements,each evaluation indicator is interrelated and restrictive.Meanwhile,the determination of each indicator value will resolve the success or failure of the suitability evaluation work.For another,it is of great vital to consider the effect of strata depth as the main factor in suitability evaluation.Thus,based on contingency theory,this paper establishes the comprehensive evaluation model for the combination of improved indicator value and restrictive evaluation of sensitive factors.Moreover,by analyzing the characteristics of engineering geology requirement at different depth level,the paper constructs the indicator system of suitability evaluation at various levels.Taking Jiaxing as an example,the comprehensive evaluation of the suitability of underground engineering requirement is realized from transverse and vertical directions,respectively,to provide a scientific basis and theoretical principle for the rational exploitation of urban planning and underground space.The findings of this paper are as follows:(1)A comprehensive evaluation model for the suitability of geological requirement of underground space development engineering is constructed.Furthermore,according to the diverse characteristics of underground space engineering geological requirements,the classification is evaluated.For common factors,considering the internal difference of each index and the different combination state,based on the principle of contingency theory,the subsection weight function of the index state is constructed.Besides,the initial weight of the analytic hierarchy process is redistributed,then,the weighted summation method is used to construct the general factor evaluation model.For the sensitive factors,the buffer range is obtained from the GIS,and the buffer and the non buffer are assigned by the binary value method,then,the product elimination method is used to establish the sensitivity factor evaluation model.In the end,two models are synthesized,for underground space development engineering geology requirement,to construct the suitability evaluation sensitivity factor—contingency comprehensive evaluation model.(2)The index system of suitability evaluation of engineering geology requirements at different depth levels is established.Through comprehensive analysis of the major engineering geological factors in the development of urban underground space at different depths,the first-level and second-level indices corresponding to different depth levels are selected from five aspects,including topographic and geomorphic conditions,engineering geological conditions,hydrogeological conditions,geological tectonic conditions and adverse geological effects,then classified as common factors and sensitive factors.Lastly,the evaluation index system of shallow layer,middle level and deep depth is established respectively.(3)The implementation and verification of a comprehensive evaluation model for the suitability of layered engineering geology conditions based on GIS.Owe to the comprehensive Evaluation model and index system,the spatial analysis technology of GIS is used to analyze the correlation.Taking Jiaxing as an example,the paper adopts the vector unit partition mode to realize the "layering and grading"comprehensive evaluation of the underground space development engineering geology requirement.In conclusion,Compared with the evaluation result of traditional methods,the applicability and reliability of the method in the determination of index weight and hierarchical evaluation is verified by combining with actual engineering survey results. |
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